Melt spinning process and its effect on the magnetic properties and structures of SM(CO, FE, CU, ZR)Z melt-spun ribbons

Sm-Co magnet was attracted attention due to its high Curie temperature and superior comprehensive magnetic properties. Different with powder metallurgy method, melt spinning is another efficient way to prepare Sm-Co magnet. The quenching speed in melt spinning is a critical factor to obtain ribbons with high magnetic properties. Recently, D.Y. Feng et al. reported that intrinsic coercivity of SmCo_6.8Zr_0.2 ribbons increases from 1.54kOe to 13.45 kOe with the wheel speed rising from 5 m/s to 60 m/s. And the crystallographic c-axis is parallel to the ribbon plane for the ribbons melt-spun at low speeds of 5 and 15 m/s, and this c-axis orientation is weakened at higher speeds. Tetsuji Saito et al. reported that Fe content has an effect on the phase composition. A small substitution of Fe for Co in the SmCo₅ alloy leads to the formation of the Sm(Co, Fe)₅ phase, but that the large substitution of Fe for Co results in the formation of other phases such as the Sm(Co, Fe)₇ and Sm₂(Co, Fe)₇ phases. In this paper, the influence of the wheel surface speeds on the thickness of the as-spun Sm-Co ribbons was discussed firstly, and then the magnetic properties and microstructures of the Sm(Co_0.93-x-yFe_xCu_0.07Zr_y)_7.8 ribbons with different Fe and Zr contents were investigated.